Pull rod lock for pumps



Sept. 8, 1953 E T |NGRAM 2,651,551

' PULL ROD LOCK FOR PUMPS 4 5 Claims.

This invention relates to pumping machinery and more especially to a pump rod cage for the pump rod.

An object of the invention is to provide a simple, practical and inexpensive device of the character described.

Another object of the invention is to provide improvements in a pump cage for the pull rod of a pump whereby the pull rod is prevented from turning more than a. pre-determined maximum amount.

A further object of the invention is to provide a bushing mounting for the pull rod of a pump, the rod having a, non-circular cross section and the bushing having a corresponding bearing passage whereby the pull rod is permitted to turn a small amount but is prevented from working loose from the supporting gear.

An additional object of the invention is to provide a pull rod having a square section and a bushing having a similar section, the bushing being mounted in a cage which permits the bushing to turn a restricted amount whereby the pull rod is prevented from working loose from its supporting gear.

Other objects and advantages will appear and be brought out more fully in the following speciiication, reference being had to the accompanying drawing wherein:

Fig. 1 is a view in sectional elevation of a pump cage embodying a preferred form of my invention.

Fig. 2 is a top plan view of the same.

Fig. 3 is a sectional view taken along the line 3-3 of Fig. 2 showing the parts partially disassembled.

Fig. 4 is a sectional view taken along the line 4-4 of Fig. 3.

Fig. 5 is a sectional view taken along the line 5-5 of Fig. 3.

Referring more particularly to the drawing I show a pump cage I which is generally cylindrical in shape, having a. body II threaded at I2 for connection to a pump of the type usually employed in the oil industry.

Cage I0 has a neck I3 formed with a bore I4, and an annular shoulder I for seating a cylindrical bushing I6. B'ore I4 is threaded at I'I for a, lock nut I8, which together with a lock washer I9, may be locked in place at the top of neck I3.

Bushing I6 has a square opening or aperture 20 therethrough, through which extends a pump pull rod 2l which has a corresponding square section, and lock nut I8 has an aperture 22 which permits pull rod 2| to move freely therethrough.

UNH-151D, STATES I B mail... Campani AmImation November 21, 1949, serial No. 128,610

Bushing I6 has an upstanding lug 23, and nut I8 has a, depending lug 24, there being a `clearance between the top of lug 23 and the bottom of nut I8, and likewise a clearance between the bottom of lug 24 and the top of bushing I6. Lugs 23 and 24 are seen to have a small angular dimension, and it should be clear that lug 24 serves as an angular stop for lug 23 of bushing I6 if and when the bushing I6 is caused to turn due to the turning of the pull rod 2 I.

The operation of the invention should be obvious from the foregoing description. Aperture 20 in bushing I6 provides a bearing for pull rod 2|, and as this pull rod Works there is usually some tendency for it to turn or rotate, and a limited rotation is permitted bybushing I6, but this rotation is limited within an arc of less than one turn and less than 360 degrees. This construction prevents the rods below from turning and working loose.

It will be understood that the foregoing description is illustrative rather than restrictive of my invention and that changes and modications may be made without departing from the spirit and scope of the sub-joined claims.

Having described my invention what I claim 1s:

1. A bearing cage adapted for attachment to a'pump means having a non-circular cross-section as described, comprising in combination a body having a bore formed with a seat, a bushing on said seat having a non-circular aperture for said means, a bushing retaining collar having threaded engagement in said bore, and means to permit limited rotation of said bushing in said bore, said means comprising interengaging lugs on said bushing and collar.

2. A bearing cage adapted for attachment to a pump means having a non-circular cross-section as described, comprising in combination a body having a bore formed with a seat, a'- bushing on said seat having a non-circular aperture for said means, a bushing retaining collar having threaded engagement in said bore, and means to permit limited rotation of said bushing in said bore, said means comprising axially extending interengaging lugs on said bushing and collar.

3. A bearing cage adapted for attachment to a pump means having a non-circular cross-section as described, comprising in combination a body having a bore formed with a seat, a bushing on said seat having a polygonal aperture for said means, a bushing retaining collar having threaded engagement in said bore, and means to permit limited rotation of said bushing in said bore, said 4 means comprising axially extending interengaging on said seat having a square aperture for ing lugs on said bushing and collar. said means, a bushing retaining collar having 4. A bearing cage adapted for attachment to threaded engagement in said bore, and means a pump means having a non-circular cross-secto permit limited rotation of said bushing in said tion as described, comprising in combination a 5 bore, said means comprising axially extending body having a bore formed with a seat, a bushinterengaging lugs on said bushing and collar. ing on said seat having a rectangular aperture EVERT T. INGRAM. for said means, a bushing retaining collar having threaded englgggment in said-Abqrehandmeans Y References Cited in the le Of this patent to permwu'riidsmwop f'sibuhinmad 1o sTdEs'HfmaN-'is bore, sait!I meanseomprisingaxialf exten n interengaging lugs on said bushing and collar. Nggg S mName A gt-81895 5. A bearing cage adapted for attachment tio 9951228 Hlrvgfn 8' 1908 a pump means havms a non clruaccnssm Bushmg Oct 23 1928 

